Summary
Chelidamic acid forms with iron a complex at pH 5.8 to 8.5 having the maximum absorption at 460 nm. The metal to reagent ratio is 1∶3 and the instability constant is about 8.21 · 10−15. The complex obeys Beer's law from 0.4 to 16 ppm of iron and the optimum concentration range is 1 to 8 ppm, with a relative analysis error of 2.3% per 1% absolute photometric error.
Zusammenfassung
Chelidamsäure bildet mit Eisen beiph 5,8–8,5 einen Komplex, der bei 460 nm ein Absorptionsmaximum aufweist. Das Verhältnis Metall: Reagens beträgt 1∶3, die Instabilitätskonstante etwa 8,21 · 10−15 Das Beersche Gesetz wird im Bereich von 0,4–16 ppm befolgt, der optimale Konzentrationsbereich liegt bei 1–8 ppm. Der relative Fehler beträgt 2,3% je 1% absoluten photometrischen Fehler.
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Majumdar, A.K., Bag, S.P. Spectrophotometric determination of iron with chelidamic acid. Z. Anal. Chem. 185, 435–439 (1962). https://doi.org/10.1007/BF00489562
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DOI: https://doi.org/10.1007/BF00489562